PR 11302

	PR 11302
	* dwarf2.c (read_abbrevs): Return NULL on alloc failures.
	(read_attribute_value, decode_line_info): Likewise.
	(add_line_info, read_rangelist): Return FALSE on alloc failures.
	(arange_add, sort_line_sequences): Likewise.
	(find_abstract_instance_name): Handle failures from called funcs.
	(scan_unit_for_symbols, parse_comp_unit, decode_line_info): Likewise.
	(find_line): Realloc to a temp, and handle alloc fail.